Upper airway involvement in bronchiectasis is marked by early onset and allergic features.

Compared with patients without UASs, among those with UASs, post-infectious aetiology was significantly less common (12.9% versus 29.1%; p=0.01), the prevalence of asthma was higher (14.3% versus 5.5%; p=0.036), the median peripheral eosinophil count was higher (230 versus 200 μL −1 ; p=0.015) and the total IgE level was higher (median 100 versus 42 IU·mL −1 ; p=0.085), but did not reach statistical significance.

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